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머플러에 유입되는 배기가스의 유동 압력에 관한 수치해석
이중섭(Chungseub Yi),최석천(Seukcheun Choi),서정세(Jeongse Suh),정한식(Hanshik Chung),정효민(Hyomin Jeong),배태열(Taeyeol Bae) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study represents Numerical study on the fluid flow characteristics of exhaust gas into the motorcycle muffler. Numerical analysis with Computational Fluid Dynamics(CFD) was carried out to investigate the exhaust gas that flow into the motorcycle muffler. The STAR-CD S/W used for the three dimensional steady state CFD analysis in a muffler. The Navier-Stokes Equation is? solved with the SIMPLE method with a general Cartesian coordinates system. RNG k-e and MARS(Monotone Advection and Reconstruction Scheme) were used for turbulence model and convection term, respectively.
이중섭(Chungseub Yi),지명국(Myoungkuk Ji),심규진(Kyujin Shim),정한식(Hanshik Chung),이철재(Cheoljae Lee),배재영(Jaeyoung Bae) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This study represents numerical study on the thermal and fluid flow characteristics of exhaust gas in a motorcycle muffler. The reference engine was used 124.㏄ small displacement. Numerical analysis with computational fluid dynamics(CFD) was carried out to investigate the exhaust gas that flow into a motorcycle muffler. The STAR-CD S/W used to three dimensional steady state CFD analysis in a muffler. And than We got the information of static pressure it is used to structural analysis ant the first baffle plate using the commercial CAE code ANSYS workbench. Exhaust gas flow third chamber from frist chamber and running second chamber. A simulation result shows that each chamber of muffler temperature is about 460 K, 445 and 463K and pressure is about 22,000 Pa, 16,000 Pa and 10,000 Pa.
2륜 자동차 적용을 위한 촉매변환기의 유동분포에 관한 연구
이중섭(Chungseub Yi),공태우(Taewoo Kong),서정세(Jeongse Suh),정한식(Hanshik Chung),정효민(Hyomin Jeong),배재영(TJaeyoung Bae) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
This paper represents the fluid flow uniformity and pressure drop in catalytic converter. Present research model type is monolithic catalytic converter. This type has been widely used to meet the environment regulation of pollution in automobiles. The flow characteristics in a single monolith automotive catalytic converter are investigated using a computational simulation method. The numerical model state, with general Cartesian coordinates system, is regarded as steady, uncompressible flow and RNG/k-ε turbulence model. Several design parameters, including the geometry of monolith centers, are investigated by their effects on fluid flow uniformity in the converter.
이중섭(Chungseub Yi),공태우(Taewoo Kong),이효덕(Hyodeok Lee),정효민(Hyomin Jeong),정한식(Hanshik Chung) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The purpose of this study is the develop LNG vaporizer as a heat source. LNG Vaporizers must be smaller, more efficient, and easier to operate and maintain. Recently, the vaporizers with great enhanced performance compared to conventional type have been developed to fulfill these requirements. The vaporizing characteristic of LNG vaporizer with air as heat source has a fixed iced. These characteristic cause a low efficiency in vaporizer, total plant cost and installing space can be increased. On that reasons, enhanced type of LNG vaporizer is optimized through numerical pipes analysis and experiments.
이륜자동차의 촉매 변환기 내부 유동 균일도에 관한 수치해석
이중섭(Chungseub Yi),서정세(Jeongse Suh),정한식(Hanshik Chung),정효민(Hyomin Jeong),배태열(Taeyoul Bae),배재영(Jaeyoung Bae) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
This study represents about the flow uniformity and pressure drip in catalytic converter. Present research model type is monolithic catalytic converter and this type have been widely used for satisfy and the regulations of pollutant emissions in automobiles. The flow characteristics in a single monolith automotive catalytic converter were investigated by using a computational simulation method. The numerical model with a general cartesian coordinates system is assumed as the steady state, compressible flow and RNG/k- turbulence model. The inlet flow of catalytic converter is assumed as a ε uniform distributed flow and it was varied from 2㎧ to 20㎧. Flow uniformity can be improved by inlet velocity increasing. As a numerical simulations, the efficiency of model-3 is increased by inserting a inner guide.
2륜 자동차 적용을 위한 촉배변환기 내의 유동 균일도와 압력강하에 대한 연구
이중섭(Chungseub Yi),공태우(Taewoo Kong),서정세(Jeongse Suh),정효민(Hyomin Jeong),정한식(Hanshik Chung),배재영(Jaeyoung Bae) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This study is flow uniformity and pressure drip in catalytic converter. Present research model type is monolithic catalytic converter. So, this type have been widely used satisfy the regulations of pollutant emissions in automobiles. The flow characteristics in a single monolith automotive catalytic converter were investigated using a computational simulation method. The numerical model with a general cartesian coordinates system is assumed as the steady state, compressible flow and RNG/k-ε turbulence model. The inlet flow of catalytic converter is assumed as a uniform distributed flow and it was varied from 2㎧ to 12㎧. The efficiency of diffuser is increased by rounding the shape of diffuser.
이중섭(Chungseub Yi),이병호(Byungho Lee),심규진(Kyujin Shim),이용훈(Yonghun Lee),정한식(Hanshik Chung),이철재(Cheoljae Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This study represents the flow uniformity and pressure drop in catalytic converter. Present research model type is a monolithic catalytic converter. So, this type have been widely used for satisfaction the regulations of pollutant emissions in automobiles. The mean experimental parameter was engine speed and ceramics monolith in the catalytic converter. The exhaust pressure was measured with pressure sensor. The experimental test engine model was used the 124.1cc motorcycle engine. The phase of exhaust pressure with high speed was moved according to increasing engine speed comparing with exhaust pressure with low speed. Also, the distribution of exhaust pressure at the megaphone type is similar with distribution of without monolith at catalytic converter. Present research models was taken as a base model and megaphone type was used for advanced model. Normally, the base type shape is used in automotive exhaust system. But megaphone type is not used in automotive exhaust system. Therefore, Megaphone type is applied newly at motorcycle.
2륜 자동차 촉매변환기에 배기가스 온도균일도 특성과 Light-Off에 관한 연구
이중섭(Chungseub Yi),정한식(HanShik Chung),정효민(HyoMin Jeong),박원조(WonJo Park),최병근(ByeongKeun Choi) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This study represents the flow uniformity and pressure drop in catalytic converter. Present research model type is a monolithic catalytic converter. So, this type have been widely used for satisfaction the regulations of pollutant emissions in automobiles. The mean experimental parameter was engine speed and ceramics monolith in the catalytic converter. The experimental test engine model was used the 124.1㏄ motorcycle engine. The experimental study using thermal imaging method shows the megaphone type model has larger effective area than that of the basic model. The rate of effective area in the basic model is about 8.9 % and the megaphone type model has 41.52%, 34.60%, 33.43%, 25.43%, 17.82% according to the diffuser angle 4°, 8°. In conclusion, the megaphone type monolithic converter has higher efficiency of reducing the pollution with less noise compared to the basic shape and we believe this will be very important as an design guide of the advanced motorcycle.